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From bugzi...@apache.org
Subject [Bug 60510] New: Apache segrafults after reload when using HTTP2
Date Thu, 22 Dec 2016 12:13:53 GMT
https://bz.apache.org/bugzilla/show_bug.cgi?id=60510

            Bug ID: 60510
           Summary: Apache segrafults after reload when using HTTP2
           Product: Apache httpd-2
           Version: 2.5-HEAD
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: blocker
          Priority: P2
         Component: mod_http2
          Assignee: bugs@httpd.apache.org
          Reporter: pavel@netsafe.cz
  Target Milestone: ---

Hi,
after Apache update from 2.4.23 to 2.4.25 we suddenly got apache segfaults.

Steps to reproduce:
1. start httpd
2. GET some pages using HTTP2
3. reload apache (kill -USR1)
4. goto 2

After one iteration I got:
[Thu Dec 22 12:02:29.022628 2016] [core:notice] [pid 20447:tid 140060432906112]
AH00052: child pid 21963 exit signal Segmentation fault (11)

Backtrace:
Core was generated by `/apache/bin/httpd'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00000000005890c7 in h2_beam_bucket ()
(gdb) bt
#0  0x00000000005890c7 in h2_beam_bucket ()
#1  0x000000000058b008 in h2_beam_receive ()
#2  0x000000000057cbf0 in fill_buffer ()
#3  0x000000000057d103 in h2_stream_out_prepare ()
#4  0x000000000057576b in on_stream_resume ()
#5  0x0000000000566c7b in h2_mplx_dispatch_master_events ()
#6  0x0000000000578e43 in h2_session_process ()
#7  0x000000000055af91 in h2_conn_run ()
#8  0x000000000055f9cd in h2_h2_process_conn ()
#9  0x00000000004764d9 in ap_run_process_connection ()
#10 0x0000000000476b73 in ap_process_connection ()
#11 0x00000000005c9808 in process_socket ()
#12 0x00000000005ca632 in worker_thread ()
#13 0x00007f07fb9338de in ?? ()
#14 0x0000000000000000 in ?? ()


After two iterations I got:
[Thu Dec 22 12:03:10.191242 2016] [mpm_worker:notice] [pid 20447:tid
140060432906112] AH00297: SIGUSR1 received.  Doing graceful restart
[Thu Dec 22 12:03:10.192828 2016] [core:notice] [pid 20447] AH00060: seg fault
or similar nasty error detected in the parent process

Backtrace:
Core was generated by `/apache/bin/httpd'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x0000000000589079 in h2_register_bucket_beamer ()
(gdb) bt
#0  0x0000000000589079 in h2_register_bucket_beamer ()
#1  0x000000000055ea67 in h2_h2_register_hooks ()
#2  0x000000000055896a in h2_hooks ()
#3  0x0000000000468b08 in ap_register_hooks ()
#4  0x00000000004373ac in main ()

Other SW: debian oldstable, nghttp2-1.17.0

Does anybody has same problem?

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